NATURAL GAS PREPARATION METHOD Russian patent published in 2018 - IPC F25J3/02 

FIELD: oil and gas industry.

SUBSTANCE: method for absorption preparation of natural gas implies natural gas subjected to primary separation, after which gas is cooled and supplied to secondary separation, cooled again and supplied to absorber input. In the absorber, gas is subjected to absorption with liquid hydrocarbon absorbent which is obtained from liquid hydrocarbon flow separated from the primary separator by its sequential three-stage three-phase separation followed by rectification and heating. After the second stage of three-phase separation, liquid hydrocarbon flow is heated. The gas withdrawn from the absorber is heated and supplied to the consumer. The flow of liquid hydrocarbons after secondary separation, the flow of liquid hydrocarbon phase portion after the first stage of three-phase separation, flow of liquid hydrocarbons withdrawn from the absorber and gas flow consisting of mixed gas phase flows after the second and third stages of three-phase separation and the flow of gases isolated after rectification is subjected to mixing, after which methane-ethane fraction is separated from produced mixture and said mixture is supplied as liquid hydrocarbon product to the consumer.

EFFECT: improvement of natural gas preparation quality.

6 cl, 2 dwg